2006509 has 4 divisors (see below), whose sum is σ = 2053216. Its totient is φ = 1959804.

The previous prime is 2006507. The next prime is 2006549. The reversal of 2006509 is 9056002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2006509 - 2¹ = 2006507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2006509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2006503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23289 + ... + 23374.

It is an arithmetic number, because the mean of its divisors is an integer number (513304).

2^2006509 is an apocalyptic number.

It is an amenable number.

2006509 is a deficient number, since it is larger than the sum of its proper divisors (46707).

2006509 is an equidigital number, since it uses as much as digits as its factorization.

2006509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46706.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 2006509 is about 1416.5129720550. The cubic root of 2006509 is about 126.1286374167.

The spelling of 2006509 in words is "two million, six thousand, five hundred nine".